diff --git a/app/src/main/java/org/ntlab/acanthus_client/resources/gallery/LayersRest.java b/app/src/main/java/org/ntlab/acanthus_client/resources/gallery/LayersRest.java
index 028a4b8..0cf0a27 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/resources/gallery/LayersRest.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/resources/gallery/LayersRest.java
@@ -1,4 +1,13 @@
 package org.ntlab.acanthus_client.resources.gallery;
 
+import retrofit2.Call;
+import retrofit2.http.GET;
+import retrofit2.http.Path;
+
 public interface LayersRest {
+    //-----------------------------------------------------------------
+    //
+    @GET("gallery/{aid}/pageMap/{pid}/layers/{layerNo}")
+    Call<Integer> getStrokeSize(
+            @Path("aid") Integer aid, @Path("pid") Integer pid, @Path("layerNo") Integer layerNo);
 }